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/* Copyright (c) 1991 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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* flip picture file horizontally and/or vertically
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*/
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#include <stdio.h>
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#include "color.h"
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int xres, yres; /* input resolution */
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long *scanpos; /* scanline positions */
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int fhoriz, fvert; /* flip flags */
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FILE *fin; /* input file */
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char *progname;
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int i;
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progname = argv[0];
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for (i = 1; i < argc; i++)
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if (!strcmp(argv[i], "-h"))
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fhoriz++;
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else if (!strcmp(argv[i], "-v"))
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fvert++;
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else
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break;
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if (i >= argc || argv[i][0] == '-') {
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fprintf(stderr, "Usage: %s [-h][-v] infile [outfile]\n",
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progname);
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exit(1);
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}
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if ((fin = fopen(argv[i], "r")) == NULL) {
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fprintf(stderr, "%s: cannot open\n", argv[1]);
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exit(1);
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}
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if (i < argc-1 && freopen(argv[i+1], "w", stdout) == NULL) {
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fprintf(stderr, "%s: cannot open\n", argv[i+1]);
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exit(1);
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}
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/* transfer header */
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copyheader(fin, stdout);
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/* add new header info. */
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printargs(i, argv, stdout);
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putchar('\n');
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/* get picture size */
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if (fgetresolu(&xres, &yres, fin) != (YMAJOR|YDECR)) {
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fprintf(stderr, "%s: bad picture size\n", progname);
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exit(1);
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}
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/* write new picture size */
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fputresolu(YMAJOR|YDECR, xres, yres, stdout);
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/* goto end if vertical flip */
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if (fvert)
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scanfile();
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flip(); /* flip the image */
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exit(0);
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}
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memerr()
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{
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fprintf(stderr, "%s: out of memory\n", progname);
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exit(1);
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}
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scanfile() /* scan to the end of file */
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{
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extern long ftell();
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COLR *scanin;
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int y;
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if ((scanpos = (long *)malloc(yres*sizeof(long))) == NULL)
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memerr();
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if ((scanin = (COLR *)malloc(xres*sizeof(COLR))) == NULL)
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memerr();
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for (y = yres-1; y >= 0; y--) {
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scanpos[y] = ftell(fin);
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if (freadcolrs(scanin, xres, fin) < 0) {
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fprintf(stderr, "%s: read error\n", progname);
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exit(1);
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}
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}
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free((char *)scanin);
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}
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flip() /* flip the picture */
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{
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COLR *scanin, *scanout;
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int y;
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register int x;
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if ((scanin = (COLR *)malloc(xres*sizeof(COLR))) == NULL)
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memerr();
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if (fhoriz) {
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if ((scanout = (COLR *)malloc(xres*sizeof(COLR))) == NULL)
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memerr();
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} else
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scanout = scanin;
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for (y = yres-1; y >= 0; y--) {
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if (fvert && fseek(fin, scanpos[yres-1-y], 0) == EOF) {
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fprintf(stderr, "%s: seek error\n", progname);
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exit(1);
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}
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if (freadcolrs(scanin, xres, fin) < 0) {
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fprintf(stderr, "%s: read error\n", progname);
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exit(1);
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}
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if (fhoriz)
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for (x = 0; x < xres; x++)
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copycolr(scanout[x], scanin[xres-1-x]);
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if (fwritecolrs(scanout, xres, stdout) < 0) {
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fprintf(stderr, "%s: write error\n", progname);
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exit(1);
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}
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}
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free((char *)scanin);
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free((char *)scanout);
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}
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